Telephone Ringing Circuits
Wiring diagrams and circuitry info for ring signals.
www.hut.fi/Misc/Electronics/circuits/telephone_ringer.html
Telephone Circuit Diagrams
How to rewire your system to set up an intercom system, remote control, phone broadcaster, visual ringer, and others.
www.electronic-circuits-diagrams.com/telephones_circuits.shtml
Headworks
Telephone headsets and accessory products.
www.headworksheadsets.com
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